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//
// zug: transducers for C++
// Copyright (C) 2019 Juan Pedro Bolivar Puente
//
// This software is distributed under the Boost Software License, Version 1.0.
// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
//
#include <zug/compose.hpp>
#include <zug/into_vector.hpp>
#include <zug/transducer/filter.hpp>
#include <zug/transducer/map.hpp>
#include <zug/transducer/transducer.hpp>
#include <catch2/catch.hpp>
using namespace zug;
namespace test_detail {
struct to_string_t
{
std::string operator()(int x) const;
};
struct stoi_t
{
int operator()(std::string x) const;
};
} // namespace test_detail
TEST_CASE("into_vector, type deduction")
{
using namespace test_detail;
static_assert(
std::is_same<std::vector<int>,
decltype(into_vector(identity, std::vector<int>{}))>{},
"");
static_assert(
std::is_same<std::vector<std::tuple<int, std::string>>,
decltype(into_vector(identity,
std::vector<int>{},
std::vector<std::string>{}))>{},
"");
static_assert(std::is_same<std::vector<std::string>,
decltype(into_vector(map(to_string_t{}),
std::vector<int>{}))>{},
"");
static_assert(
std::is_same<std::vector<int>,
decltype(into_vector(map(stoi_t{}),
std::vector<std::string>{}))>{},
"");
}
TEST_CASE("into_vector, zipping")
{
auto v1 = std::vector<int>{1, 2, 3, 4};
auto v2 = std::vector<std::string>{"a", "b"};
using tup = std::tuple<int, std::string>;
auto res = into_vector(identity, v1, v2);
CHECK(res == (std::vector<tup>{tup(1, "a"), tup(2, "b")}));
}
TEST_CASE("into_vector, transduction")
{
auto v = std::vector<int>{1, 2, 3, 4};
auto xform = comp(filter([](int x) { return x % 2 == 0; }),
map([](int x) { return std::to_string(x); }));
auto res = into_vector(xform, v);
CHECK(res == (std::vector<std::string>{"2", "4"}));
}
TEST_CASE("into_vector, type erasure")
{
auto v = std::vector<int>{1, 2, 3, 4};
auto xform = transducer<int, std::string>{
comp(filter([](int x) { return x % 2 == 0; }),
map([](int x) { return std::to_string(x); }))};
auto res = into_vector(xform, v);
CHECK(res == (std::vector<std::string>{"2", "4"}));
}
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